it is built out of 1. 5 HREW x.130 wall hrew .the same as the three buggys in the pic I have built that are out their getting the **** beat out of them an are holding up just fine. I buy this material in big lots so I can get it cheaper . I'm not saying it is better then anything eles just a affordable way to get out their . I am currently building two high power big boy buggys out of dom so I don't care one way or the other what tube I'm using the two black buggys have v8s an tons the Orange one has v6 an dana 44s